Nitriding an Oxygen-Doped Nanocarbonaceous Sorbent Synthesized via Solution Plasma Process for Improving CO2 Adsorption Capacity

The synthesis of carbon nanoparticles (Cn) and oxygen-doped nanocarbon (OCn) was successfully done through a one-step synthesis by the solution plasma process (SPP). The Cn and OCn were nitrogen-doped by nitridation under an ammonia atmosphere at 800 °C for 2 h to yield NCn and NOCn, respectively, for carbon dioxide (CO2) adsorption. The NOCn exhibited the highest specific surface area (~570 m2 g−1) and highest CO2 adsorption capacity (1.63 mmol g−1 at 25 °C) among the synthesized samples. The primary nitrogen species on the surface of NOCn were pyridinic-N and pyrrolic-N. The synergistic effect of microporosity and nitrogen functionality on the NOCn surface played an essential role in CO2 adsorption enhancement. From the thermodynamic viewpoint, the CO2 adsorption on NOCn was physisorption, exothermic, and spontaneous. The NOCn showed a more negative enthalpy of adsorption, indicating its stronger interaction for CO2 on the surface, and hence, the higher adsorption capacity. The CO2 adsorption on NOCn over the whole pressure range at 25–55 °C best fitted the Toth model, suggesting monolayer adsorption on the heterogeneous surface. In addition, NOCn expressed a higher selective CO2 adsorption than Cn and so was a good candidate for multicycle adsorption.

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Effect of the Presence of Water-soluble Amines on the Carbon Dioxide (CO2) Adsorption Capacity of Amine-grafted Poly-succinimide (PSI) Adsorbent During CO2 Capture

Energy Procedia ◽

10.1016/j.egypro.2016.01.010 ◽

2016 ◽

Vol 86 ◽

pp. 90-105 ◽

Cited By ~ 9

Author(s):

Tafara Chitsiga ◽

Michael O. Daramola ◽

Nicola Wagner ◽

Jacob Ngoy

Keyword(s):

Carbon Dioxide ◽

Adsorption Capacity ◽

Co2 Capture ◽

Co2 Adsorption ◽

Water Soluble ◽

Co2 Adsorption Capacity ◽

Carbon Dioxide Co2

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Upgrading of Biogas to Methane Based on Adsorption

Processes ◽

10.3390/pr8080941 ◽

2020 ◽

Vol 8 (8) ◽

pp. 941

Author(s):

Jun Liu ◽

Qiang Chen ◽

Peng Qi

Keyword(s):

Carbon Dioxide ◽

Hydrogen Sulfide ◽

Adsorption Capacity ◽

Co2 Adsorption ◽

Anaerobic Fermentation ◽

Biogas Yield ◽

13X Zeolite ◽

Low Co2 ◽

Co2 Adsorption Capacity ◽

Carbon Dioxide Co2

Upgrading raw biogas to methane (CH4) is a vital prerequisite for the utilization of biogas as a vehicle fuel or the similar field as well. In this work, biogas yield from the anaerobic fermentation of food waste containing methane (CH4, 60.4%), carbon dioxide (CO2, 29.1%), hydrogen sulfide (H2S, 1.5%), nitrogen (N2, 7.35%) and oxygen (O2, 1.6%) was upgraded by dynamic adsorption. The hydrogen sulfide was removed from the biogas in advance by iron oxide (Fe2O3) because of its corrosion of the equipment. Commercial 13X zeolite and carbon molecular sieve (CMS) were used to remove the other impurity gases from wet or dry biogas. It was found that neither 13X zeolite nor CMS could effectively remove each of the impurities in the wet biogas for the effect of water vapor. However, 13X zeolite could effectively remove CO2 after the biogas was dried with silica and showed a CO2 adsorption capacity of 78 mg/g at the condition of 0.2 MPa and 25 °C. Additionally, 13X zeolite almost did not adsorb nitrogen (N2), so the CH4 was merely boosted to ac. 91% after the desulfurated dry biogas passed through 13X zeolite, nitrogen remaining in the biogas. CMS would exhibit superior N2 adsorption capacity and low CO2 adsorption capacity if some N2 was present in biogas, so CMS was able to remove all the nitrogen and fractional carbon dioxide from the desulfurated dry biogas in a period of time. Finally, when the desulfurated dry biogas passed through CMS and 13X zeolite in turn, the N2 and CO2 were sequentially removed, and then followed the high purity CH4 (≥96%).

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A comparison of CO2 adsorption behaviour of mono- and diamine-functionalised adsorbents

E3S Web of Conferences ◽

10.1051/e3sconf/20199001010 ◽

2019 ◽

Vol 90 ◽

pp. 01010 ◽

Cited By ~ 3

Author(s):

Noor Ashikin Mohamad ◽

Ebrahim Abouzari Lotf ◽

M. Nasef Mohamed ◽

Ahmad Arshad ◽

TAT Abdullah

Keyword(s):

Electron Microscopy ◽

Adsorption Capacity ◽

Co2 Adsorption ◽

Morphological Changes ◽

Adsorption Behaviour ◽

X Ray Diffraction ◽

X Ray ◽

Co2 Adsorption Capacity ◽

Carbon Dioxide Co2 ◽

Scanning Electron

The paper presents a study for investigating i) the effect of amination of poly(GMA)-grafted polyethylene/polypropylene (PE/PP) substrates with trimethylamine (TMA) and ethylenediamine (EDA) and ii) their impact on carbon dioxide (CO2) adsorption capacity of the obtained adsorbents. The chemical, structural, and morphological changes of the aminated adsorbents were evaluated using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM), respectively. The amination yield with TMA was 40% higher than EDA. However, the obtained adsorbent showed two times lower CO2 adsorption capacity (at 30 bars) than the adsorbent with EDA and stood at 0.6 mmol g-1 compared to 1.2 mmol g-1.

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